Before I tell you, make this a suggestion on the Suggestion Forums not here.
Now, I play Creative a lot too, and every time I check out a plot the annoying 2/5 of your screen
is unseeable. So I don't suggest to but it away, but to make a command that disables it.
A cheap way to avoid this is to put yourself in "F1" mode by, obviously, hitting the F1 key on your keyboard.
But this disabled the visibility of the chat, so that will be a "not-so positive side effect".